Hormones may have this effect as can any internal abnormality. Blood sugar, infection, medications can all lead to vasodilation which causes that flushed feeling. I wouls recommend seeing a physician to have some blood work and an overall physical exam.
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I would be interested to know about symptoms and psa numbers in past. Based just on the information provided, I would recommend a prostate biopsy to rule out prostate cancer. If the biopsy is negative, you may consider a medication such as finasteride or dutasteride to reduce the size of the prostrate. Of course, there are side effects with meds.
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I would recommend that you have an examination by a qualified provider. It is possible that you have acute prostatitis. Other things to consider would be a urethral stricture or injury to the urethra. Bottom line, get it checked out if symptoms persist.
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I would advise that you have a liver function test performed at least yearly to make sure there is no permanent damage to your liver. If your liver function tests are normal then you can safely take Cialis on a regular basis.
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You should take the prescribed medication as directed and not double up.

Make sure a urine culture was obtained. This will assure that you are on the correct antibiotic. The antibiotic could be affecting your birth control pills and I would strongly advise that you use protection during intercourse until the next cycle as the antibiotics may make the birth control pills less effective.
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A simple urinalysis would tell you this. It is also possible that you have a kidney stone that is causing the pain. Also in rare cases, you may have prostatitis. Probably nothing dangerous but if it worsens you may need to have somebody take a look at it.
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Although Proteus is a true infection, the likelihood of the bacteria entering the bloodstream is minimal.

Antibiotics can typically steriize the urine within 24 hours, however, Proteus can be associated with kidney stones. It is important to rule out a kidney stone with an ultrasound of the kidney. If a stone is present, the bacteria can shed especially if they are resistant to the antibiotic.
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